Buchner Funnel for Regular Mouth Mason Jars

Introducing my all-new Buchner Funnel Vacuum Filtration system for regular mouth Mason jars.

This innovative design utilizes regular mouth (2.40" [60mm]) mason jars as platform for vacuum filtration of liquids from solids.

• Print from PLA or PETG ~65g material
• Print seal from TPU ~ 1g material
• Total print time ~4 hours
• Prints without supports
• Design includes print profile for funnel, vacuum spigot, and TPU lid seal.
• Requires gluing the vacuum spigot to the funnel
• Approximate assembled dimensions 4"W x 4"D x 1.8"H [101mmW x 101mmD x 46mmH]
• Vacuum spigot 0.19" [5mm] OD

If you don't have TPU filament for the seal you can purchase a standard O-ring with the size: 65mm OD x 58mm ID x 3.5mm Width, similar to the one found here.

Design requires you to supply your own regular mouth mason jar and vacuum pump.

What is a Buchner funnel?

A Büchner funnel is a specialized laboratory funnel used for vacuum filtration, a technique used to separate solids from liquids. It consists of a funnel-shaped vessel, typically made of glass or porcelain, with a perforated plate (Buchner plate) at the bottom. This plate is covered with filter paper to trap solid particles while liquid passes through the perforations. 

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Assembly instructions:

After funnel has finished printing, find tapered vacuum hole on the side, and remove any burring with an Exacto blade to ensure a clean fit of the vacuum spigot.

Remove adhesion brim from printed spigot.

Glue tapered end of spigot into the port on the funnel

Install TPU seal with the round side towards the funnel and push into place at the base of the threads (I installed with Crisco to help lubricate the seal, you could use food safe grease, vacuum grease, etc.)

Thread the finished cap onto a regular mouth mason jar, connect to a vacuum pump, and using your filter paper of choice, let the filtration begin!

Happy Printing!